Gosh! Southeastern birds (5)
I believe the answer is:
geese
'birds' is the definition.
(goose is a kind of bird)
'gosh south-eastern' is the wordplay.
'gosh' becomes 'gee' (I've seen this in other clues).
'south eastern' becomes 'se'.
'gee'+'se'='GEESE'
(Other definitions for geese that I've seen before include "Six of these are 'a-laying' on 31 December" , "wingers" , "Christmas birds" , "Web-footed migratory aquatic birds" , "Proverbially silly birds" .)